RASMUSSEN, Sten; KRAMHØFT, Morten; SPERLING, Kim; PEDERSEN, Jens. Increased flexion and reduced hospital stay with continuous intraarticular morphine and ropivacaine after primary total knee replacementOpen intervention study of efficacy and safety in 154 patients. Acta Orthopaedica, [S. l.], v. 75, n. 5, p. 606–609, 2004. DOI: 10.1080/00016470410001501. Disponível em: https://actaorthop.org/actao/article/view/19561. Acesso em: 13 may. 2026.